When I was young I had a dog that found a box of chocolates wrapped and under the Christmas tree. While we were gone, he opened it and ate them all, foil and all. He didn't seem to have any problems, but there was some concern as to problems when it came time to pass the foil, but everything came out all right.

Had a Whitman's sampler wrapped up under the tree many moons ago. He chewed through the corner of the box and pulled out a handful and scoffed them. If he had any teeth today, I'm sure he'd do the same

Oh, the heads that turn
Make my back burn
And those heads that turn
Make my back, make my back burn